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The reduction of stresses and strains in high-quality welded structures through the application of innovative welding methods

Kudła Krzysztof, Makles Krzysztof, Wojsyk Kwiryn, Macherzyński Michał

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2023

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Vol. 67, No. 2

44--50

EN

The study discussed in the article aimed to compare the high-performance robotic MAG TANDEM process with the partly mechanised MAG STANDARD process. Experimental tests involved comparisons concerning the heat effect of the dual-electrode MAG TANDEM process with that accompanying the single-electrode MAG STANDARD process. The tests also included comparisons of linear welding energy (heat input) and its effect on stresses and strains generated during the fabrication of welded structures.

PL

Przedmiotem badań była analiza porównawcza wysokowydajnego, zrobotyzowanego procesu MAG TANDEM ze spawaniem częściowo zmechanizowanym MAG STANDARD. Prowadzone prace eksperymentalne obejmowały porównanie oddziaływania cieplnego spawania dwuelektrodowego MAG TANDEM ze spawaniem jednoelektrodowym MAG STANDARD. W obu procesach porównano wartości energii liniowej spawania (wprowadzonego ciepła) i jej wpływ na wielkość naprężeń i odkształceń, które powstają podczas wytwarzania konstrukcji spawanych.

2

The FEM-based numerical analysis of welding distortions in spatial-flat elements of large-sized welded structures

Pikuła Janusz, Pfeifer Tomasz, Niagaj Jerzy

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2019

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Vol. 63, No. 4

15--26

EN

The issue of welding distortions concerns both large welded structures such as bridges, storage tanks and elements of welded building structures as well as small and precise elements. Particularly susceptible to welding distortions are thin-walled structures, in which hard-to-predict welding distortions are responsible for serious technical problems. This paper presents the results concerning the welding of spatial and flat elements used in large-sized welded structures in terms of welding distortions. Due to their geometry, large welded structures may be the source of complex welding distortions, e.g. corrugations. The research-related works discussed in the article were carried out using the finite element method (FEM). The validation of FEM model of the welding process was performed using an optical system measuring welding distortions of an actual structure.

PL

Problem odkształceń spawalniczych dotyczy zarówno dużych konstrukcji spawanych takich, jak konstrukcje mostowe, zbiorniki magazynowe i elementy spawanych konstrukcji budowlanych, jak również niewielkich, precyzyjnych elementów. Szczególnie podatne na odkształcenia spawalnicze są konstrukcje cienkościenne, w których trudno przewidywalne odkształcenia spawalnicze powodują poważne problemy techniczne. W niniejszym artykule przedstawiono wyniki badań spawania elementów przestrzenno-płaskich stosowanych w wielkogabarytowych konstrukcjach spawanych w aspekcie odkształceń spawalniczych, w których, ze względu na ich geometrię, istnieje możliwość powstania złożonych odkształceń spawalniczych (np. pofałdowań). Badania przeprowadzono przy użyciu metody elementów skończonych (MES), a walidację modelu numerycznego MES spawania przeprowadzono przy użyciu pomiaru systemem optycznym spawalniczych odkształceń rzeczywistej konstrukcji.

3

Non-destructive testing of welded structures

Kochel M., Pasieka D.

Szybkobieżne Pojazdy Gąsienicowe

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2017

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nr 1 (43)

69--77

EN

The article describes methods for non-destructive testing of welded joints, with particular focus on structures of high strength. Examples of structural units tested at OBRUM are presented along with the justification of the choice of the test method applied. In summary, reference is made to the limitations of the test methods and to possible errors in the assessment of the correctness of the welded structures.

4

The use of welding techniques in protection of welding structures against corrosion

Kowalski J. S., Mazur M., Wojciechowski W.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 3 spec.

293--298

EN

The paper presents possibilities of using welding techniques as a means of protection from corrosion of materials for welding structures operating in power engineering industry, chemical industry and shipbuilding. Based on the example of an LNG installation, the potentials of weld overlaying in anti-corrosive protection of parts operating in LNG installations have been described. The weld overlaying technique enables building up of protective coatings, which not only protect material from corrosion resulting from the flow of more or less aggressive medium (e.g. water, exhaust gas) but also increase the performance life of thus “coated” elements due to the improved abrasion wear resistance of weld overlays. The weld overlaying process is equally well suitable in building of new structures as in the repair of damaged or worn out elements of water or power feeding installations.

5

Studies of welded joints

Krupa J. M., Wojciechowski W.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 3 spec.

195--200

EN

Studies of a welded joint were described. The joint was made as a result of the reconstruction of a truss and one of the possible means to make a repair. The studies were of a simulation character and were targeted at the detection of welding defects and imperfections that should be eliminated in a real structure. A model was designed and on this model the tests and examinations were carried out. The model was made under the same conditions as the conditions adopted for repair. It corresponded to the real object in shape and dimensions, and in the proposed technique of welding and welding parameters. The model was composed of five plates joined together with twelve beads. The destructive and non-destructive tests were carried out; the whole structure and the respective welds were also examined visually. The defects and imperfections in welds were detected by surface methods of inspection, penetration tests and magnetic particle flaw detection. The model of the welded joint was prepared by destructive methods, a technique that would never be permitted in the case of a real structure. For the investigations it was necessary to cut out the specimens from the welded joint in direction transverse to the weld run. The specimens were subjected to metallographic examinations and hardness measurements. Additionally, the joint cross-section was examined by destructive testing methods to enable precise determination of the internal defects and imperfections. The surface methods were applied again, this time to determine the severity of welding defects. The analysis has proved that, fabricated under proper conditions and with parameters of the welding process duly observed, the welded joint has good properties and repairs of this type are possible in practice.